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Question1
The ozone concentration in an atmosphere is measured in Dobson Units. We say that the amount of ozone is 1 DU when there are 2x10^6 molecules of Ozone in an atmospheric column with a cross-section of 1 cm^2. The average ozone absorption in atmosphere is around 300 DU. a) compute average number of ozone molecules in an atmospheric column with a cross-section of 1 m^2? b) What is an average number of ozone molecules in a similar column over Antarctica when the "ozone hole" is at its peak of 100 DU?
Question2
Take two long identical plane mirror strips. Illustrate lines making angles of 30o, 45o, 60o,75o and 90o on a unruled plane paper sheet fixed on a horizontal board. Place reflecting surfaces of the mirror strips along the arms of 30o angle vertically, using plasticine. Place a piece of coloured glass between two mirrors and see how numerous images of it are formed in all. Show again the experiment for other angles counting the number of images formed in each case. Tabulate number of images (n) against angle of inclination between the mirrors (q). Illustrate a graph between q and n. Do you see any relationship between these two quantities?
After a 0.813 nm x-ray photon scatters from a free electron, the electron recoils with a speed equal to 1.46E+6 m/s. Through what angle was the photon scattered
A rectangular block of ice 14.0 m on each side and 1.4 m thick floats in sea water. The density of the sea water is 1025 kg/m3. The density of ice is 917 kg/m3.
A ring of charge of radius R meters has a constant charge density -lambda distributed uniformly along its length. Find the expression for |E| near the center of the ring
The pilot of an aircraft wishes to fly due west in a 34.60 km/h wind blowing toward the south. The speed of the aircraft in absence of a wind is 145 km/h.
A 206 n sign hangs from the end of a 3.30 m long bar. find the two forces exerted by bolts A and B
A particle with charge of 7.70 microC and v= 435 m/s is acted on by both an electric and magnetic field. what is the strength of the magnetic field
A slender rod with a length of 0.300m rotates with an angular speed of 8.80rad/s about an axis through one end and perpendicular to the rod. What is the induced emf in the rod
The motion of a particle is given by x= Asin^3(wt). What is the expression for the particle's velocity
A series RLC circuit has components with the following values: L = 18.0 mH, C = 90.0 nF, R = 10.0 ?, and ?Vmax = 100 V, with ?v = ?Vmax sin ?t. Find the resonant frequency of the circuit
A soccer player kicks the ball toward a goal that is 27.0 m in front of him. Find the speed of the ball when the goalie catches it in front of the net
A certain freely falling object requires 1.7s to travel the last 37m before it hits the ground. From what height above ground did it fall.
four charges, q1=1.5 nC, q2=4nC, q3=20nC and q4=-1nC are placed so that q4=(0,0) q1 is north of q4 and .5m away q2 is east of q4 and 1.0m away q3 is SW of q4 at angle of 36.9 degrees
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